Tzone21

iTrader: (2)

My car cranks and starts just fine but if i attempt to start it and it stalls for what ever reason (i have to give it some gas or it WILL stall) then it will not start at all for an extended period of time (from 12-24 hours). I can get it to start if i jump it from another vehicle but even then it struggles and i can barley get it to get going.

I know fuel pressure is good and my pump works as it was checked by my buddy at the sport Chevrolet dealership. I just recently replaced all 8 spark plugs (3 miles?) and i have MSD plug wires with less than 10k. When i replaced the spark plugs it would actually start as my last plugs were fouled from not having a tune and driving for a short period of time.

My throttle body was causing my engine to rev to redline from engine start up but that was resolved by replacing my throttle body position sensor.

I found a torn vacuum line behind the intake manifold and replaced it with the updated Y tube from GM.

Does anyone have any ideas?

Tzone21

iTrader: (2)

bumppp

C4 LS1

It may be the idle air control valve not operating properly. That is what lets the right amount of air bypass the closed throttle body without any pedal applied. I read somewhere there is a way to test it but I don't remember where it was...

Tzone21

iTrader: (2)

Ill have to look it up, or i may just go to my mechanic buddy at sport Chevrolet and let him use his fancy $1500 plug in computers and see if its reading correctly.